In an interview on IGN today, Lead Developer Colin Johanson said that the team learned a lot from the first season of GW2's living world, especially how much the players loved to speculate and discover patch additions organically. He said that the team observed players becoming more engaged when ArenaNet dropped in content that wasn't spelled out in the patch notes.
Johanson said this trend will continue: "You don't know what's going to happen and you don't know what you're going to find. Every week you want to search every corner of the world because the next hint for the living world could be hidden anywhere."
Johanson talked about the great changes to the world, especially in regard to the team nuking the city of Lion's Arch. He mentioned a player who predicted that the event would occur back in January: "It was really interesting for us to see that, and to be able to point back at him and say, 'Hey man, you nailed it!' and to be able to call that out was really cool."